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/* ttyio.c - tty i/O functions
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* This file is part of G10.
*
* G10 is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* G10 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <errno.h>
#include <ctype.h>
#include "util.h"
#include "memory.h"
#include "ttyio.h"
static int last_prompt_len;
static FILE *
open_tty(void)
{
FILE *tty = fopen("/dev/tty", "r");
if( !tty )
log_fatal("cannot open /dev/tty: %s\n", strerror(errno) );
return tty;
}
static void
close_tty( FILE *tty )
{
fclose(tty);
}
void
tty_printf( const char *fmt, ... )
{
va_list arg_ptr;
va_start( arg_ptr, fmt ) ;
last_prompt_len += vfprintf(stderr,fmt,arg_ptr) ;
va_end(arg_ptr);
fflush(stderr);
}
/****************
* Print a string, but filter all control characters out.
*/
void
tty_print_string( byte *p, size_t n )
{
for( ; n; n--, p++ )
if( iscntrl( *p ) ) {
putc('\\', stderr);
if( *p == '\n' )
putc('n', stderr);
else if( !*p )
putc('0', stderr);
else
fprintf(stderr, "x%02x", *p );
}
else
putc(*p, stderr);
}
char *
tty_get( const char *prompt )
{
char *buf;
int c, n, i;
FILE *fp;
last_prompt_len = 0;
tty_printf( prompt );
buf = m_alloc(n=50);
i = 0;
fp = open_tty();
while( (c=getc(fp)) != EOF && c != '\n' ) {
last_prompt_len++;
if( c == '\t' )
c = ' ';
else if( iscntrl(c) )
continue;
if( !(i < n-1) ) {
n += 50;
buf = m_realloc( buf, n );
}
buf[i++] = c;
}
close_tty(fp);
buf[i] = 0;
return buf;
}
char *
tty_get_hidden( const char *prompt )
{
return tty_get( prompt ); /* fixme */
}
void
tty_kill_prompt()
{
int i;
#if 0
for(i=0; i < last_prompt_len; i ++ )
fputc('\b', stderr);
for(i=0; i < last_prompt_len; i ++ )
fputc(' ', stderr);
for(i=0; i < last_prompt_len; i ++ )
fputc('\b', stderr);
#endif
last_prompt_len = 0;
fflush(stderr);
}
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